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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3d8965bd1174c178a2410f6068cd6e583498d338f2603c1f74ddf543c9e9ad' 
  AND token = 'c6ubWQLa42gRJvXLMEBM/f71pn2CK23AcxaqgjnhHh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}